Pen



FIG. 1 is a top, rear, right side perspective view of a pen showing our new design;

FIG. 2 is a top, front, right side perspective view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a bottom view thereof;

FIG. 6 is a left side view thereof;

FIG. 7 is a rear view thereof; and,

FIG. 8 is front view thereof. 

CLAIM We claim the ornamental design for a pen, as shown and described. 